How do scientists build on previous work when developing theories

Chemistry

2 answers:

lana66690 [7]2 years ago

7 0

Scientist first give hypothesis and also they keep working harder

lana66690 [7]2 years ago

3 0

Answer:

Theories are explanations of a natural or social behavior, event, or phenomenon. More formally, a scientific theory is a system of constructs concepts and propositions relationships between those constructs that collectively presents a logical, systematic, and coherent explanation of a phenomenon of interest within some assumptions and boundary conditions. Using a "Hypothises" and the sientific "Method".

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9. Write a balanced nuclear equation for the following: The isotope Strontium-90 decays by Q-

Sergio039 [100]

Answer: $_{38}^{90}\textrm{Sr}\rightarrow _{36}^{86}\textrm{Kr}+_2^4\textrm{He}$

Explanation:

Alpha Decay: In this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. The mass number is reduced by 4 units and atomic number is reduced by 2 units.

General representation of an element is given as: $_Z^A\textrm{X}$

where,

Z represents Atomic number

A represents Mass number

X represents the symbol of an element

General representation of alpha decay :

$_Z^A\textrm{Sr}\rightarrow _{Z-2}^{A-4}Y+_2^4\alpha$

The balanced nuclear equation when the isotope Strontium-90 decays by Q- decay is :

$_{38}^{90}\textrm{Sr}\rightarrow _{36}^{86}\textrm{Kr}+_2^4\textrm{He}$

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3 years ago

What is catalyst? Write its types.

Step2247 [10]

Answer:

A catalyst is a chemical substance that alters the rate of chemical reaction not consumed by the reaction. Hence, a catalyst can be recovered chen unchanged at the ends of chemical reaction. Catalyst can be divided into two typ the basis whether it speeds up or slowdowns the rate of chemical reaction. The positive catalyst and negative catalyst.

5 0

3 years ago

Read 2 more answers

Please help me vote you brainiest

Viktor [21]

Answer:

Explanation:

A equal

B opposite

C equal

D opposite

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